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प्रश्न
Explain the following reaction with balanced chemical equation:
Calcium reacts with water.
उत्तर
Calcium reacts with water with some vigor to produce calcium hydroxide solution and sets free hydrogen gas. Resulting solution is warm.
\[\ce{Ca + 2H2O -> Ca(OH)2 + H2_{(g)}}\]
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संबंधित प्रश्न
Give any two differences between alkanes and alkenes.
‘A’ is an element having four electrons in its outermost orbit. An allotropes ‘B’ of this element is used as a dry lubricant in machinery and in pencil leads. So:
i. Write the name of element ‘A’ and its allotropes.
ii. State whether ‘B’ is a good conductor or non-conductor of electricity?
Define Saturated hydrocarbon.
Define Unsaturated hydrocarbon.
Write the number of covalent bonds in the molecule of ethane.
Give a chemical test to distinguish between saturated and unsaturated hydrocarbons.
Explain in brief two main reasons for carbon forming a large number of compounds.
Why does carbon form strong bonds with most other elements ?
How many structural isomers can you draw for pentane?
Draw the electron dot structures for propanone.
Draw the electron dot structures for F2.
A cyclic hydrocarbon having carbon-carbon single bonds as well as carbon-carbon double bonds in its molecule is:
(a) C6H12
(b) C6H14
(c) C6H6
(d) C6H10
Which of the following will give addition reaction and why?
C4H10, C2H6, C2H4, CH4, C3H8, C3H4
Which of the two is better for our health : butter or vegetable oil? Why?
Which of the following hydrocarbons can decolourise bromine water and which cannot? Why?
C6H12, C6H14, C6H10
How many double bonds are there in a saturated hydrocarbon?
Identify the unsaturated compounds from the following
- Propane
- Propene
- Propyne
- Chloropropane
Identify and name the functional groups present in the following compounds.
- \[\begin{array}{cc}
\ce{H}\phantom{...}\ce{H}\phantom{...}\ce{H}\phantom{..}\\
\phantom{}|\phantom{....}|\phantom{....}|\phantom{..}\\
\ce{H - C - C - C - OH}\\
\phantom{}|\phantom{....}|\phantom{....}|\phantom{..}\\
\ce{H}\phantom{...}\ce{H}\phantom{...}\ce{H}\phantom{..}\\
\end{array}\] - \[\begin{array}{cc}
\phantom{...}\ce{H}\phantom{...}\ce{H}\phantom{...}\ce{H}\phantom{....}\\
\phantom{...}|\phantom{....}|\phantom{....}||\phantom{....}\\
\ce{H - C - C - C - OH}\\
\phantom{...}|\phantom{....}|\phantom{.........}\\
\phantom{}\ce{H}\phantom{...}\ce{H}\phantom{.......}\\
\end{array}\] - \[\begin{array}{cc}
\phantom{......}\ce{H}\phantom{....}\ce{H}\phantom{....}\ce{O}\phantom{...}\ce{H}\phantom{...}\ce{H}\phantom{.......}\\
\phantom{....}|\phantom{....}|\phantom{....}||\phantom{....}|\phantom{....}|\phantom{....}\\
\ce{H} - \ce{C} - \ce{C} - \ce{C} - \ce{C} - \ce{C} - \ce{H}\\
\phantom{....}|\phantom{.....}|\phantom{........}|\phantom{....}|\phantom{....}\\
\phantom{....}\ce{H}\phantom{....}\ce{H}\phantom{........}\ce{H}\phantom{..}\ce{H}\phantom{.....}\\
\end{array}\] - \[\begin{array}{cc}
\phantom{......}\ce{H}\phantom{...}\ce{H}\phantom{...}\ce{H}\phantom{...}\ce{H}\phantom{......}\\
\phantom{....}|\phantom{....}|\phantom{....}|\phantom{....}|\phantom{....}\\
\ce{H - C - C - C = C - H}\\
\phantom{....}|\phantom{....}|\phantom{.............}\\
\phantom{....}\ce{H}\phantom{...}\ce{H}\phantom{.............}
\end{array}\]
A compound X is formed by the reaction of a carboxylic acid C2H4O2 and an alcohol in presence of a few drops of H2SO4. The alcohol on oxidation with alkaline KMnO4 followed by acidification gives the same carboxylic acid as used in this reaction. Give the names and structures of
- carboxylic acid
- alcohol and
- the compound X.
Also write the reaction.
